US3031989A - Sewing machine with ring supported bobbin - Google Patents

Description

May 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5 Sheets-Sheet 1 Inventors May 1, 1962 w. ENGEL ET AL SEWING MACHINE WITH RING SUPPORTED BOBBIN 5 Sheets-Sheet 2 Filed Aug. 5, 1958 Inventors Wax/ 6w; vrgcz 44 0 #444; enwwarr:

May 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5 Sheets-Sheet 5 May 1, 962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 5 Sheets-Sheet 4 /mhg y 1, 1962 w. ENGEL ET AL 3,031,989

SEWING MACHINE WITH RING SUPPORTED BOBBIN Filed Aug. 5, 1958 r 5 Sheets-Sheet 5 United States Patent 3,031,989 SEWING MACHINE WITH RING SUPPORTED BOBBIN Wolfgang Engel, Bielefeld, and Hans Baumotte, Brackwede, Germany, assignors to Anker-Phoenix Nahmaschinen Aktiengesellschaft, Bielefeld, Germany Filed Aug. 5, 1958, Ser. No. 758,637 (Filed under Rule 47(2) and '35 U.S.C. 116) Claims. (Cl. 112-180) The invention relates to a sewing machine of the type having a ring supported bobbin which cooperates with the looper in which for the purpose of removing the bobbin casing the housing portion or plate adjacent the material feed dog must be opened. In such a machine the removing and particularly also the insertion of the bobbin casing for exchanging the bobbin in an aperture in the frame presents particular difliculties. With the feed dog closure open one is compelled to reach into the interior of the material carrying plate ahead of the looper frame in order to release the latching of this bobbin supporting ring.

It is an object of the invention to simplify this rather cumbersome operation in a flat bed as well as in a free arm machine.

In accordance with the invention this object is achieved in that the. material feed plate or housing closure is coupled with the bobbin ring in such a manner that during opening or closing the material feed plate or other closure the bobbin ring is automatically brought into the position for sewing.

This operation can be etfected, for example, in such a manner that the free end of the bobbin ring frame is linked with the material feed plate. If the material feed plate or housing closure is then moved downwardly with its inner end, the ring support is simultaneously opened and the bobbin housing is disposed in a position to be readily picked up by the seamtress.

For this purpose the ring frame and the material feed plate can be biased as a unit by means of a spring which aids in the opening operation of the housing closure or the material feed plate. If in the sewing position of the ring frame in the flat bed machine the link which connects the material feed plate and the ring support and the pivot pin for the material feed plate are disposed approximately at right angles, then the unintentional opening of the material feed plate as a result of pressure upon the plate is avoided.

The unintentional opening of the material feed plate and thus also the unintentional opening of the ring support may furthermore be prevented in that the ring support is provided with a latch having a lever. Ahead of this latching lever a locking sewing position of the ring support which is movable by means of a manipulating device which can be operated from the exterior.

In order to enable use of the sewing machine for normal sewing operations as well as for embroidery or mending operations it is customary to arrange the material feed dog in a manner that it can be lowered. For this purpose known machines are provided with a manipulating means which is connected by way of suitable linkage means to the material feed dog. In accordance with the invention the manipulating means which is provided in a flat bed machine for the latching as well as for the opening and the closing operation is simultaneously utilized for the raising and the lowering of the material feed dog.

In free arm machines material feed plates are not known. Instead the free arm is provided with a housing closure lid which is adapted to carry also the ring for the ring looper along its inner wall.

lever will be disposed in the "ice . machines having a housing closure flap.

Further details of the invention will become apparent from the embodiments illustrated in the drawings in which:

FIG. 1 is a bottom view of the sewing machine showing the driving gear,

FIG. 2 is a section taken along line II-II in FIG. 1 in the direction of the arrows,

FIG. 3 is a section long line III-III of FIG. 1 taken in the direction of the arrows,

FIG. 4 is a section along line IVIV of FIG. 1 with I the ring support closed seen in the direction of the arrows,

FIG. 5 is a section along line IVIV of FIG. 1 with the ring support open taken in the direction of the arrows,

FIG. 6 is a plan view of the sewing machine base plate indicating the locations for the lowering of the material feed dog and for opening the ring support,

FIG. 7 is afront view of the free arm with its driving gear components and the feed dog lowering mechanism,

FIG. 8 is a top view upon the free arm showing the driving gear and the feed dog lowering means with the cover removed,

FIG. 9 is a section along the line IXIX in accordance with FIGS. 7 and 8 taken in the direction of the arrows,

FIG. 10 is a section along line XX in FIGS. 7 and 8 taken in the direction of the arrows,

FIGS. 11 is an end view of the free arm in accord-. ance with FIG. 7 looking in the direction of the arrow with the free arm closure lid latched, and

FIG. 12 is a view of the free arm seen in the direction of the arrow with the free arm closure open.

The belt pulley of the arm shaft which is not illustrated and which is secured upon the main drive shaft of the sewing machine drives intermediate shaft 2 mounted in the base 1" through the standard 1' by way of belt pulley 3 and belt 3 at a ratio of 1:1.

A worm gear 4 is mounted at the left front end of the intermediate shaft 2 having a corresponding gear 5 which is mounted upon the transversely disposed looper shaft 6 and which. drives at its front end the looper 7 at a ratio 2:1. The looper shaft 6 is carried at its rear end in the bearing sleeve 6 which is mounted in the base '1". The base 1" is provided with a cover plate 1" for reasons of manufacturing convenience.

The thrust for the feed dog 8 (FIGS. 3 and 4) is produced by means of a cam 9 mounted upon intermediate shaft 2 which cam cooperates with an adjustable grooved guide block 10 (FIG. 2). The forked lever 11 which is connected to the slide and reaches around cam 9 is provided on one side with the stud 12 which carries the sliding member 13 which moves in the grooved block 10. The other end of the forked lever 11 is linked to the stud 14 which is secured in the crank 15 which transmits the movement of the forked lever 11 to the feed shaft 17 mounted in the base 1" by means of pintles 16 and 16.

' The movement of the feed shaft 17 is transmitted by way of crank 18 to the feed bar 19 at the forward end of the base 1" and the material feed dog 8 is secured to the forward end of said feed bar. By means of the operat ing handle 20 journalled in the standard 1' the position of the grooved member 10 and thus the material feed dimension and direction is varied by way of the connecting bar 21 and the crank 22 secured upon the stud 12 in the grooved block 10 (see FIG. 2).

The thrust of the feed dog 8 is produced by means of a cam 24 upon the intermediate shaft 2 (see FIG. 3).

The connecting bar 23 engages the cam 24 at one end. The connecting bar is linked at its other end to the one arm 25 of the angular lever 25 in the base 1". The jaws 19' of the feed bar 19 engage the shaft 26 which is mounted for axial displacement on the other end of the lever arm 25 of the angular lever 25 (see FIG. 6).

The lowering of the feed dog 8 is effected by a setting knob 27 journalled in the rear portion of the base 1". Its shaft 27 guided in the base 1 carries a crank 28 to which is linked one end of the draw bar 29 while the other end is linked by means of an eyelet 29 to the central part of a lever 36 which is secured by means of screw 30 to the base 1". An elongated slot 30 is'provided in the fore part of the lever 30 which is engaged by a pin 31 of the shaft 26. By rotating the setting knob 27 to the position III indicated in dotted lines, the draw bar 29 by way of crank 28, the lever 30 and the pin 31 withdraws the shaft 26 from the jaws 19' of the feed bar 19. Thus the path for lowering the feed bar 19 with the feed dog secured thereto is freed. By rotating the setting knob 27 into the position II, indicated in dotted lines, the shaft 26 is pushed back by spring 39 over lever 30 into the jaws 19' of the feed bar 19 and the thrust movement of the angular lever 25 is again transmitted to the feed bar 19.

The looper 7 upon the looper shaft 6 in its course, engages the bobbin housing 7, which is held in its position by a ring 32' in the ring support 32. The ring support 32 carries a pivot support such as fixed bolt 33 at its lower end which is journalled in the base 1 in bearings 33' and 33" at right angles with respect to the looper shaft 6. Bolt 33 carries at its right end a lever 34 which can be secured in position by means of screw 34' and which at its. upper end engages lever 30 when the looper ring is in closed position (see FIG. dotted lines). By rotating the setting knob 27 into position I the lever 30 is shifted in the direction towards the looper 7 by way of draw bar 29 and with the lever 34 on the shaft 33 released the ring on the frame is drawn down by means of tension spring 35 to the abutment 36 which is secured to the base 1" by means of screws 36' and 36". The closure slide or feed plate 37 which is linked to the upper end of the ring support 32 by hinge means in the form of pin 35 is simultaneously shifted along a longitudinal slot 38' about the bolt 38 mounted in the base 1" in the direction of the arrow A shown in FIG. 5. The ring 32' is now opened and thus free for exchanging the bobbin. The closing of the ring 32 is effected by the pressure upon the outer edge of the closure slide or feed plate 37 in the direction of the arrow B thereby moving the feed plate to the horizontal position upon the cover plate 1 which closes the base 1". In this position the lever 30 is shifted by means of spring 39' in front of lever 34 which holds the ring frame 32 in closed position upon the common shaft 33. The base 1 is advantageously provided with a closure plate 40, the lower four corners of which are provided with rubber feet 41 to thus secure the upper part of the machine against sliding and also to protect the operating components provided in the interior against soiling, or also to collect any oil which might drop down.

The arrangements described hereinabove, the opening of the, ring frame 32 by means of a manipulating member provided externally of the upper part of the machine relate to flatbed machines.

Hereinafter an embodiment is described with reference to FIGS. 7-12 which relates to free arm sewing machines. The drive shaft 52 journalled in free arm 51 is driven by way of a pulley upon the arm shaft (not shown) by way of a second belt pulley 53 and the belt 53' at a ratio 1:1. A worm gear 54 which is secured upon drive shaft 52 meshes with a cooperating gear 55. The latter is provided upon the intermediate shaft 51 by means of screws and provides for the transmission to the transverse- 1y disposed looper shaft 59 at a ratio 2:1. The inter- 4 sleeves 56' and 56" in the free arm 51. At the left front end of the intermediate shaft 56 a warm gear 57 is provided which in turn meshes with teeth of the coopcrating gear 58 provided upon looper shaft 59 thus insuring the drive at a ratio of 1:1 with respect to looper 60.

The thrust for the material feed bar 61 is produced by means of a cam 62 secured to drive shaft 52 in combination with the adjustable grooved block 63 (see FIGS. 8 and 9). At the closed jaw lever 64 which engages cam 62, a bolt 65 is riveted on one side which carries the slide member 66 which slides in the grooved block 63. The other end of the closed jaw lever 64 is linked to the bolt 67 which is secured to the crank 68 (see FIG. 9). The crank 68 is fastened upon feeding shaft 71 by means of the collar screw 68' and transmits the movement of the closed jaw lever 64 to the feed bar 71 provided in the free arm 51 and journalled on pintles 69 and 70 which at the forward end of the free arm 51 support crank arms 72 and 73 in which the. pintles 74 and 75 are journalled. These conical pintles 74 and 75 support the feed bar 76 suspended therebetween and upon the forward end of which is secured the feed dog 61 by means of the two collar screws 77 and 78. By shifting the manipulating handle 79 journalled externally of the base 51" upwardly or downwardly in the base 51' the movement is transferred by way of connecting bar 80 and the crank 83 secured to the extended. stud 63 (FIG. 8), of the slide block 63 to the feed dog 61 and determines the magnitude and direction of feed in relation to the position of the grooved block 63.

The stroke of the feed dog 61 is likewise produced by a cam 82 which is axially displaceable upon the single rotation drive shaft 52 (FIGS. 8 and 10). By means of a slide member 84 adjustably secured by means of a screw 83 upon the forward portion of the feed bar 76, the feed bar 76 is supported upon cam 82 and is held in position upon cam 82 by a tension spring 85 suspended on the pin 85' in the free arm 51. The lowering of the feed dog 61 below the stitch plate 61' is effected by a setting knob 86 which is accessible from the exterior and mounted on the rear portion of the free arm 51. The crank is secured upon the shaft 88 by means of screw 89 journalled in the sleeve 87 in free arm 51. In the lower part of the crank 90 the pin 92 which is provided with a screw 91 is secured which with its projecting portion 92' engages the groove 93' of the disk 93 which is secured upon a draw bar 94 by means of a screw 94' which through a drive shaft 52 in the form of a hollow shaft leads forward to the displaceable stroke cam 82. The cam 82 is secured by means of a cylindrical pin 95 to the draw bar 94 in the forward end of the stroke cam 82 which secures the stroke cam 82 against rotation and simultaneously is movable in the longitudinal slot 52' of the drive shaft 53-. By rotating the setting knob 86 into position III to the right, the cam 82 upon shaft 52 is shifted to the left towards the looper v60 by way of the crank 90, pin 92, disk 93, draw bar 94 and cylinder pin 95.

The sliding member 84 comes to rest upon the cylindrical portion 82 of the cam 82 which is smaller in diameter and permits the feed dog 61 to sink below the stitch plate 61'. By turning back the setting knob 86 into position II (center) the cam 82 together with its eccentric portion 82 is withdrawn below the slide member 84 and the draw bar 76 is again brought in operative engagement'with the feed .dog- 61.

The transversely disposed shaft 59 carries at its forward end looper 68 which in its path of operation receives the bobbin shell 60, which is held in its position by means of ring 96. The ring 96 is secured in the housing lid 99 by means of its stud 97 and screwv 98 which lid is pivotally connected in free arm 51 by means of pin 100. The nose 101 of the, sliding member 102 mounted in free mediate shaft 56 is journalled at two ends in the bearing 75 arm 51 by means of sleeve engages the catch i104 secured in the housing lid 99 by means of screws 103 and 103 and thus keeps the housing lid 99 closed.

By rotating the setting knob 86 into position I toward the left the cam 82 is moved toward the right of the looper 60 by way of the aforementioned mechanism and the central part 82' of the cam 82 in combination with the pin 108 secured in the slide 102 is pushed away from the looper 60. The nose 101 of the slide frees the catch 104 and thus the housing lid 99 which is automatically opened under the pressure of the bolt 106 against spring 107 upon receding part 99 of the housing lid 99. The closing of the housing lid and thus simultaneously of the ring 96 secured therein is effected manually until the nose 101 of the slide 102 again snaps behind the catch 104 under the pressure of spring 109.

We claim:

1. In a sewing machine of the type having a housing, and including a drive shaft suported in said housing, a feed bar comprising a feed dog supported in said housing, a feed plate extending in closed condition in alignment with said feed dog, a ring looper, a bobbin, a ring tiltably supporting said bobbing proximate said looper for cooperation therewith, a rotatable shaft extending transversely of said housing and supporting said looper proximate said feed dog for rotation about its axis in fixed position relative to said feed plate, and further including driving gear for said feed bar and for said rotatable shaft and said looper operatively connected to said drive shaft; a pivot suport disposed below said looper, hinge means provided at the end of said feed plate adjacent said feed dog and a ring support carrying said bobbin supporting ring, said ring support being connected at one end to said pivot support and at the other end to said hinge means and being movable with said supporting ring and by means of said feed plate relative to said looper.

2. In a sewing machine of the type having a housing, and including a drive shaft suported in said housing, a feed bar comprising a feed dog supported in said housing, a feed plate extending in closed condition in alignment with said feed dog, a ring looper, a bobbin, a ring tiltably supporting said bobbin proximate said looper for cooperation therewith, a rotatable shaft extending transversely of said housing and supporting said looper proximate said feed dog for rotation about its axis in fixed position relative to said feed plate, and further including driving gear for said feed bar and for said rotatable shaft and said looper operatively connected to said drive shaft; a pivot support disposed below said looper, hinge means provided at the end of said feed plate adjacent said feed dog and a ring support carrying said bobbin supporting ring, said ring support being connected at one end to said pivot support and at the other end to said hinge means and being movable with said supporting ring and by means of said feed plate relative to said looper, said feed plate being pivotally supported and slidable on the machine housing for tilting movement, and said ring support being movable into inclined position in alignment with said feed plate for the position of disengagement between said ring and said looper and into a position at right angles with respect to said feed plate for the operative position of said ring relative to said looper.

3. In a sewing machine of the type having a housing, and including a drive shaft supported in said housing, a feed bar comprising a feed dog supported in said housing, a feed plate extending in closed condition in alignment with said feed dog, a ring looper, a bobbin, a ring tiltably supporting said bobbin proximate said looper for cooperation therewith, a rotatable shaft extending transversely of said housing and supporting said looper proximate said feed dog for rotation about its axis in fixed position relative to said feed plate, and further including driving gear for said feed bar and for said rotatable shaft and said looper operatively connected to said drive shaft; a pivot support disposed below said looper, hinge means provided at the end of said feed plate adjacent said feed dog and a ring support carrying said bobbin supporting ring, said ring support being connected at one end to said pivot support and at the other end to said hinge means and being movable with said supporting ring and by means of said feed plate relative to said looper, said feed plate being pivotally supported and slidable on the machine housing for tilting movement, and said ring support being movable into inclined position in alignment with said feed plate, a guide pin for said feed plate being mounted in said housing and a pair of slotted guide members being disposed below said feed plate and slidable on said guide pin.

4. In a sewing machine of the type having a housing, and including a drive shaft supported in said housing, a feed "bar comprising a feed dog supported in said housing, a feed plate extending in closed condition in alignment with said feed dog, a ring looper, a bobbin, a ring tiltably supporting said bobbin proximate said looper for cooperation therewith, a rotatable shaft extending transversely of said housing and supporting said looper proximate said feed dog for rotation about its axis in fixed position relative to said feed plate, and further including driving gear for said feed bar and for said rotatable shaft and said looper operatively connected to said drive shaft; a pivot support disposed below said looper, hinge means provided at the end of said feed plate adjacent said feed dog and a ring support carrying said bobbin supporting ring, said ring support being connected at one end to said pivot support and at the other end to said hinge means and being movable with said supporting ring and by means of said feed plate relative to said looper, said feed plate being pivotally supported and slidable on the machine housing for tilting movement, and said ring support being movable into inclined position in alignment with said feed plate, a guide pin for said feed plate being mounted in said housing and a pair of slotted guide members being disposed below said feed plate and slidable on said guide pin and an abutment being disposed in said housing below said feed plate for engagement by said ring support and said feed plate in said aligned position, and a spring being secured at one end to said housing and at the other end to the joint between said ring support and said feed plate for biasing said support and said plate downwardly.

5. In a sewing machine of the type having a housing, and including a drive shaft supported longitudinally of said housing, a feed bar supporting a feed dog and extending transversely of said housing, a feed plate extending in closed condition in alignment with said feed dog, a ring looper, a bobbin, a ring tiltably supporting said bobbin proximate said looper for cooperation therewith, a rotatable shaft extending transversely of said housing and supporting said looper proximate said feed dog for rotation about its axis in fixed position relative to said feed plate, and further including driving gear for said feed bar and for said rotatable shaft and said looper operatively connected to said drive shaft, and means for adjusting said feed dog including jaws at one end of said feed bar and a transverse shaft movable relative to said jaws; a pivot support disposed below said looper, hinge means provided at the end of said feed plate adjacent said feed dog and a ring support carrying said bobbin supporting ring, said ring support being connected at one end to said pivot support and at the other end to said hinge means and being movable with said supporting ring and by means of said feed plate relative to said looper, said feed plate being pivotally supported and slidable on the machine housing for tilting movement by means including a guide pin for said feed plate mounted in said housing and a pair of slotted guide members disposed below said feed plate and slidable on said guide pin, said means for adjusting said feed dog further including an adjusting knob and an operating lever linked to said adjusting knob and movable therewith to raise and lower said feed dog and to move said transverse shaft relative to 'said jaws, and said pivot shaft of said ring support having a member defining a latch rotatable With said pivot shaft and with said ring support adapted in the operative positon of said feed plate to engagesaidoperating lever for locking said lever in operative position. References Cited in the file of this patent UNITED STATES PATENTS 1,086,662 Gould Feb. 10, 1914 Hemle-b Aug. 4, 1925 Goosman Dec. 26, 1933 Backlin Mar. 9, 1954 FOREIGN PATENTS Germany July 22, 1933 Germany Oct. 29, 1940

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